Nonpriming steam boiler



vJain. l2, 1932.

A TTO Jan. 12, A C. CRAWFORD 1,840,386

NONPRIMING STEAM BOILER Filed June 30, 1927 3 Sheets-Sheet 2 A TTO Jan. 12, 1932. A. c. CRAWFORD v 1,840,386

NONPRIMING S TEAM BOILER Filed June 50. 1927 5 Sheets-Sheet 5 IN VENTOR.

A TTORNE Y.

Patented Jan. 12, 1932 ai :Ji a

ARTHUR C. CRAWFORD, OF MENDOTA, CALIFORNIA NONIRIMING STEAM BOILER ApplicationI filed .Tune 30,

My invention relates to super-heater steam boilers and has for an object to provide a pre-heating water ycompartment designed tovsupply heated water to the water tubes; said compartment having means for automatically regulating the level of the water and to permit the escape of steam generated therein.

' Other objects and advantages reside in the special construction, combination and arrangement of the various elements forming the invention as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein likenumerals refer to like parts throughout and in which Figure l is a vertical longitudinal sectional view, f

yFigure 2 is a transverse section thereof taken at a line 2 2 of Figure l,

Figure 3 is a sectional view of the settling drum,

Figure Lf isa plan view of my specially constructed cleaner plug gasket,

Figure 5 is a vertical sectional view thereof,

Figure 6 is a detail in section of the scale cleaner operating means,

Figure 7 is a detail of the scum skimmer, and

Figure 8 is a view of the check valve for the bafiie drain.

Referring now to the accompanying drawings, I have shown my invention comprising a. boiler including a lower section provided with a plurality of tubes 5 constituting a water tube section and an upper section provided with similar tubes 6 constituting a steam tube section, said tubes communicating at their opposite ends with front and rear heads more fully hereinafter described in detail. The sections are arranged at oppositely inclined angles, the lower section being inclined downwardly toward the rear and the upper section being inclined upwardly therefrom and thus forming a compartment 9 between the two sections of a substantially enlarged area at the rear of the boiler and within which is arranged a cone-shaped water-tight shell 10. The small or front end 1927. Serial No. 202,529.

of the shell l() is supported to the front boiler plate by braces l0. At each end of the tubes in each section is arranged a substantially vertical passage, the rear passage of the lower section constituting a rear water head 1l communieating` with the compartment 9 and the front passage thereof constituting a front water head 12. The rear passage of the upper section constitutes a rear steam head 13 and the front passage thereof constitutes a front steam head lli, the water head l2 and steam head 14s connnunicating with each other and the steam head lli-3 communicating with the compartment 9 with a cut-off valve l5 interposed therebetween operated by a iioat 16 adapted to'4 close communication therewith as more fully hereinafter explained. The movement of the float is facilitated by a counter-balanced weight 16 carried on one end of a pivotally mounted rod 4C 3;; and to which the ioat is attached at the opposite end.

The lower, or water tube section is mounted immediately above the fire box l which ends upwardly partly within such section, the roof of the fire box being indicated at 18. The front of the fire box is provided with a draft and tire door 19.

later is admitted into the shell 10 by means of a feed pipe 2O entering the front of the shell.' between the upper and lower sections and discharging the water into a mud settling drum located within the shell and inclined at an angle approximately parallel with the lower section. The drum has an opening 22 at highest point through which the water passes into the shell l0 and thus into the water tubes where ittravels forwardly as it is heated and generated into steam and thence through the heads 12 and le into the steam tubes and out by way of the steam had 13 through a steam discharge pipe 23.

Any steam generated in the shell l0 bein unable to escape through the wat-er tubos will rise to the highest part of the compartment and thus enter the steam head 13 through the valved opening l5. It is noted that if the water within shell 10 surges, or from any other cause rises from four to five CJ ILO inches underneath the opening in said shell from the normal water line, the valve 15 will automatically close, and that said valve 15 functions only to permit steam to escape therethrough. The steam generated in the shell is thereby automatically controlled by the float and utilized to increase the eficiency of the boiler. l

I also provide means for purifying the water in the shell comprising a scum skimmer having a cone-shaped head 2Lisupport-ed by a bracket and located slightly above the normal water level. The head is provided with suitable openings communicating with a pipe 26 extending outwardly from the boiler. The steam pressure in the boiler passin through pipe 26 when the blowv oli" valve is opened, functions to suck the scum and other foreign matter iioating on the water in the shell through thefdischarge pipe.

A scale cleaner is slidably arranged within Y the discharge end of the water feed pipe 20,

comprising a scraper 27 secured to the end of a rod 23 extending within the pipe and outwardly thereof through a suitable packing gland 29. The outer end of the rodis 3rovided with a handle 30 and may be screw threaded as at 3l in a support 32 so that upon the turning of the handle the scraper will. move longitudinally within the pipe as well as rotate therein. It is commonly known Vthat scale collects almost entirely at the discharge end of the feed pipe in boilers my scale cleaner is therefore admirably adopted for keeping the pipe clean.

At thedischarge end of the steam head 13 I provide a cone-shaped bailie 33 adapted to trap any water which may be sucked through the head or condensed by cooling, such water being deposited in a pocket 34 formed around one of the baiiles and returned to the water shell l0 by means of a drain pipe 35. A check valve 36 is interposed in the drain pipe to prevent the siphoning of water out of the water shell by the suction of the steam through the baille.

To the lowermost end of the settling drum' 2l I attach a sediment drain pipe 37' and a similar pipe 38 is attached at the lowermost end of the water head l1 for draining ofi' salts or'other heavy matter which accumulates therein when using hard water.

In Figure Il I have shown a specially constructed gasket 40 for use at the tube cleanout plugs 39, the gasket being preferably constructed of lead and to prevent wear caused by the pressure exerted in securing the plug I imbed in the gasket a ring l1 of copper or other semi-hard material against which the plug is forced. A gasket of this type is found considerably superior in durability and eiiiciency as the life thereof is increased and the delays incident to replacing leaking gaskets are thus avoided.

A pair of casing sections 42 are arranged at each side of the shell l0 and slightly spaced therefrom as indicated in Figure 2 of the drawings, each of said casing sectionsv being separated into upper and lower portions by a horizontally disposed bae plate 43 arranged at approximately the water line in the shell.

,Extending longitudinally between the Walls of the shell 10 and casing I provide a plurality of tubes 4a having perforations arranged throughout, the tubes being adapted to have an air hose connected thereto for blowing any soot accumulating on the sides of the shell. The lower portions of the casing sections are open to permit the heat from the fire box to enter between the wallsof the shell and casing. Y'

Q Ijlaving thus described my invention, I claim:

l. A stein boiler comprising a steam tube section and a water tube section angularly arranged with respect to each other in superimposed relation vand communicating with each other at one end, a cone shaped shell disposed longitudinallybetween said sections and having openings providing direct communication lwith the sections at the other ends thereof, means for feeding water to said shell and automatic cut-oli' means for closing the opening between said shell and steamsection.

2. A steam boiler comprising a steain tube section and a water tube section disposed in superimposed relation and at acute angles to each other, said sections communicating with each other at one'end, a cone shaped shell disposed longitudinally between said sections and having openings providing direct communication with the sections at the other ends thereof, casing sections arranged at each side of the shell in spaced relation thereto providing an air space, ymeans for feeding waterv to said shell, and automatic cut-olf means for closing the opening between said shell and steam section.

YARTHUR o. CRAWFORD.

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